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Btrfs: allocator and tuning 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-05-07 20:03:49 -04:00 коммит произвёл David Woodhouse
Родитель be74417553
Коммит 3e1ad54fe2
2 изменённых файлов: 34 добавлений и 42 удалений
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1
fs/btrfs/ctree.h
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@ -255,6 +255,7 @@ struct btrfs_block_group_item {
struct btrfs_block_group_cache {
struct btrfs_key key;
struct btrfs_block_group_item item;
struct radix_tree_root *radix;
u64 first_free;
u64 last_alloc;
u64 pinned;

73
fs/btrfs/extent-tree.c
Просмотреть файл

@ -23,7 +23,7 @@ static struct btrfs_block_group_cache *lookup_block_group(struct
(void **)&block_group,
blocknr, 1);
if (ret) {
if (block_group->key.objectid <= blocknr && blocknr <
if (block_group->key.objectid <= blocknr && blocknr <=
block_group->key.objectid + block_group->key.offset)
return block_group;
}
@ -31,11 +31,16 @@ static struct btrfs_block_group_cache *lookup_block_group(struct
(void **)&block_group,
blocknr, 1);
if (ret) {
if (block_group->key.objectid <= blocknr && blocknr <
if (block_group->key.objectid <= blocknr && blocknr <=
block_group->key.objectid + block_group->key.offset)
return block_group;
}
WARN_ON(1);
printk("lookup_block_group fails for blocknr %Lu\n", blocknr);
printk("last ret was %d\n", ret);
if (ret) {
printk("last block group was %Lu %Lu\n", block_group->key.objectid, block_group->key.offset);
}
return NULL;
}
@ -356,45 +361,20 @@ static int update_block_group(struct btrfs_trans_handle *trans,
{
struct btrfs_block_group_cache *cache;
struct btrfs_fs_info *info = root->fs_info;
struct radix_tree_root *radix;
u64 total = num;
u64 old_val;
u64 block_in_group;
int ret;
if (num != 1)
radix = &info->block_group_data_radix;
else
radix = &info->block_group_radix;
while(total) {
ret = radix_tree_gang_lookup(radix, (void **)&cache,
blocknr, 1);
if (!ret) {
cache = lookup_block_group(info, blocknr);
if (!cache) {
printk(KERN_CRIT "blocknr %Lu lookup failed\n",
blocknr);
return -1;
}
block_in_group = blocknr - cache->key.objectid;
if (block_in_group > cache->key.offset || cache->key.objectid >
blocknr) {
if (radix == &info->block_group_data_radix)
radix = &info->block_group_radix;
else
radix = &info->block_group_data_radix;
ret = radix_tree_gang_lookup(radix, (void **)&cache,
blocknr, 1);
if (!ret) {
printk(KERN_CRIT "blocknr %Lu lookup failed\n",
blocknr);
return -1;
}
block_in_group = blocknr - cache->key.objectid;
if (block_in_group > cache->key.offset ||
cache->key.objectid > blocknr) {
BUG();
}
}
WARN_ON(block_in_group > cache->key.offset);
radix_tree_tag_set(radix, cache->key.objectid +
radix_tree_tag_set(cache->radix, cache->key.objectid +
cache->key.offset - 1,
BTRFS_BLOCK_GROUP_DIRTY);
@ -693,6 +673,8 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
num_blocks = 1;
total_needed = (min(level + 1, BTRFS_MAX_LEVEL) + 2) * 3;
}
if (search_end == (u64)-1)
search_end = btrfs_super_total_blocks(info->disk_super);
if (search_start) {
block_group = lookup_block_group(info, search_start);
block_group = btrfs_find_block_group(root, block_group,
@ -704,7 +686,7 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
}
check_failed:
if (block_group->data != data)
if (!full_scan && block_group->data != data)
WARN_ON(1);
if (block_group->last_alloc > search_start)
search_start = block_group->last_alloc;
@ -734,13 +716,13 @@ check_failed:
goto error;
if (!start_found) {
ins->objectid = search_start;
ins->offset = (u64)-1 - search_start;
ins->offset = search_end - search_start;
start_found = 1;
goto check_pending;
}
ins->objectid = last_block > search_start ?
last_block : search_start;
ins->offset = (u64)-1 - ins->objectid;
ins->offset = search_end - ins->objectid;
goto check_pending;
}
btrfs_disk_key_to_cpu(&key, &l->items[slot].key);
@ -777,7 +759,7 @@ check_pending:
*/
btrfs_release_path(root, path);
BUG_ON(ins->objectid < search_start);
if (ins->objectid >= btrfs_super_total_blocks(info->disk_super)) {
if (ins->objectid + num_blocks >= search_end) {
if (full_scan)
return -ENOSPC;
search_start = orig_search_start;
@ -840,7 +822,7 @@ check_pending:
return 0;
new_group:
if (search_start >= btrfs_super_total_blocks(info->disk_super)) {
if (search_start + num_blocks >= search_end) {
search_start = orig_search_start;
full_scan = 1;
}
@ -900,7 +882,12 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
return ret;
/* then do prealloc for the extent tree */
ret = find_free_extent(trans, root, 0, ins->objectid + ins->offset,
if (ins->objectid + ins->offset >= search_end)
search_end = ins->objectid - 1;
else
search_start = ins->objectid + ins->offset;
ret = find_free_extent(trans, root, 0, search_start,
search_end, &prealloc_key, 0);
if (ret)
return ret;
@ -1198,6 +1185,12 @@ int btrfs_read_block_groups(struct btrfs_root *root)
err = -1;
break;
}
if (nr & 1)
radix = &info->block_group_data_radix;
else
radix = &info->block_group_radix;
bi = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_block_group_item);
memcpy(&cache->item, bi, sizeof(*bi));
@ -1206,12 +1199,10 @@ int btrfs_read_block_groups(struct btrfs_root *root)
cache->first_free = cache->key.objectid;
cache->pinned = 0;
cache->data = (nr & 1);
cache->radix = radix;
key.objectid = found_key.objectid + found_key.offset;
btrfs_release_path(root, path);
if (nr & 1)
radix = &info->block_group_data_radix;
else
radix = &info->block_group_radix;
ret = radix_tree_insert(radix, found_key.objectid +
found_key.offset - 1,
(void *)cache);